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Hot-dip galvanized steel pipe production process knowledge
Zinc is soluble in acids and alkalis, so it is called an amphoteric metal. Zinc is almost unchanged in dry air. In humid air, the zinc surface will generate a dense alkaline zinc carbonate film. In containing sulfur dioxide, hydrogen sulfide and marine atmosphere, zinc corrosion resistance is poor, especially in high temperature and high humidity containing organic acid atmosphere, zinc coating is very easy to be corroded.
Hot-dip galvanized pipe: is to make the molten metal and iron substrate reaction and produce an alloy layer, so that the substrate and the plating of the two combined. Hot-dip galvanizing is the first steel pipe is pickled, in order to remove the iron oxide on the surface of the steel pipe, after pickling, it is cleaned by ammonium chloride or zinc chloride aqueous solution or ammonium chloride and zinc chloride mixed aqueous solution tank, and then sent to the hot-dip plating tank. Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life. Most of the process in the north using galvanized belt directly coil tube to make up the zinc process.
Hot-dip galvanized steel pipe: steel pipe substrate and molten plating solution occurs complex physical and chemical reaction, forming a corrosion-resistant structure close zinc and iron alloy layer. Alloy layer and pure zinc layer, steel pipe matrix into one. Therefore, its corrosion resistance is strong.
In order to improve the corrosion resistance of steel pipe, the general steel pipe galvanized. Galvanized steel pipe is divided into hot-dip galvanized and electro-galvanized two kinds of hot-dip galvanized galvanized layer is thick, electro-galvanized galvanized low cost, the surface is not very smooth. Oxygen blowing welded pipe: used as a steel blowing oxygen pipe, generally with a small diameter welded steel pipe, specifications from 3/8-2 inch eight. Made of 08, 10, 15, 20 or 195-Q235 steel strip, in order to prevent corrosion, some of them have to be effectively aluminizing treatment.
Production process: galvanized strip → uncoiling → stretching → coiling → welding → scraping scars → passivation and rinsing → zinc replenishment → shaping → typing marking → cutting → packing → drying → weighing.